CN102528320B

CN102528320B - Ultralow-temperature high-toughness austenitic electrode

Info

Publication number: CN102528320B
Application number: CN201010608242.0A
Authority: CN
Inventors: 蔡鸿祥; 陈国栋; 王登峰
Original assignee: KUNSHAN GINTUNE WELDING CO Ltd
Current assignee: KUNSHAN GINTUNE WELDING CO Ltd
Priority date: 2010-12-28
Filing date: 2010-12-28
Publication date: 2014-03-19
Anticipated expiration: 2030-12-28
Also published as: CN102528320A

Abstract

The invention discloses an ultralow-temperature high-toughness austenitic electrode which consists of a core wire and a coating, wherein the coating is coated on the outer wall of the core wire and the weight coefficient of the coating to the total weight of the electrode is 0.4-0.5; the core wire is made of Cr-Ni-Mo-Mn type alloy series comprising the following components in percentage by weight: 0.006-0.015% of C, 0.08-0.20% of Si, 1.80-2.25% of Mn, 18.5-21.0% of Cr, 9.0-10.0% of Ni, 0.008-0.015% of P, 0.008-0.015% of S and the balance of Fe. The coating is made of TiO2-SiO2-CaO slag series comprising the following components in percentage by weight: 25-40% of rutile, 1-4% of titanium white, 3-12% of potassium feldspar, 5-15% of mica, 5-15% of calcium carbonate, 3-8% of barium carbonate, 2-8% of calcium fluoride, 3-8% of sodium fluoride, 2-6% of electrolytic manganese, 5-12% of chromium metal, 1-4% of nickel metal, 1-4% of ferromolybdenum and 0.01-1.5% of lanthana. The ultralow-temperature high-toughness austenitic electrode has excellent welding process property; the mechanical property of deposited metal is stable; especially, ultralow-temperature impact toughness is outstanding.

Description

Ultralow-temperature high-toughness austenitic electrode

Technical field

The present invention relates to field of welding material, particularly relate to a kind of austenitic electrode of ultralow-temperature high-toughness.

Background technology

In the last few years, along with industrial high speed development, energy problem had become the focus of global concern.The energy of land is exploitation in a large number, if the shortage energy, will seriously restrict the raising of industrial expansion and people's living standard, so the exploitation of countries in the world oil and natural gas in ocean by target lock-on, constantly for we provide stable energy resource; Develop marine resources and must build the ocean structure matching, this not only needs to adopt good steel grade, also needs the welding material matching to connect; The energy is mostly in marine site, deep-sea, so special requirement material not only will have excellent lower temperature resistance, and can tackle the corrosion of various acid in ocean; Equally, some Cryo Equipments of domestic production, as low-temperature storage tank, also need to have excellent lower temperature resistance and corrosion resistance; So welding material good in the urgent need to a kind of ultralow-temperature flexibility, corrosion resistance is good.

Summary of the invention

In order to solve the problems of the technologies described above, the invention provides a kind of ultralow-temperature high-toughness austenitic electrode, there is excellent ultralow temperature impact flexibility and good decay resistance.

The present invention for the technical scheme that solves its technical problem and adopt is:

A ultralow-temperature high-toughness austenitic electrode, consists of core wire and coating, and coating is coated on core wire outer wall, the weight coefficient that described coating accounts for welding rod gross weight is 0.4～0.5, take core wire gross weight as benchmark, and by weight percentage, described core wire is comprised of following component:

C：0.006～0.015％；

Si：0.08～0.20％；

Mn：1.8～2.25％；

Cr：18.5～21.0％；

Ni：9.0～10.0％；

P：0.008～0.015％；

S：0.008～0.015％；

Fe: surplus.

Take coating gross weight as benchmark, and by weight percentage, described coating is comprised of following component:

Rutile: 25～40%;

Titanium dioxide: 1～4%;

Potassic feldspar: 3～12%;

Mica: 5～15%;

Calcium carbonate: 5～15%;

Brium carbonate: 3～8%;

Calcirm-fluoride: 2～8%;

Sodium fluoride: 3～8%;

Electrolytic manganese: 2～6%;

Crome metal: 5～12%;

Metallic nickel: 1～4%;

Molybdenum-iron: 1～4%;

Lanthana: 0.01～1.5%.

As a further improvement on the present invention, take coating gross weight as benchmark, by weight percentage, the component of described coating is preferably as follows:

Rutile: 28～35%;

Titanium dioxide: 1～4%;

Potassic feldspar: 3～9%;

Mica: 5～13%;

Calcium carbonate: 5～10%;

Brium carbonate: 3～8%;

Calcirm-fluoride: 4～8%;

Sodium fluoride: 3～8%;

Electrolytic manganese: 2～6%;

Crome metal: 5～12%;

Metallic nickel: 1～4%;

Molybdenum-iron: 1～4%;

Lanthana: 0.01-1.15%.

In concrete analysis the present invention, the performance of performance is as follows separately in welding rod for each component of coating:

The oxidisability of rutile is more weak, and the hot removability of slag is good, arc stability, and molten bath is tranquil, makes metal with fine mist transition, and direction weldability is good, can make appearance of weld attractive in appearance, and slag covers, and anti-gas porosity is good;

The Main Function of titanium dioxide is stabilising arc, makes molten bath tranquil, splashes less, has electric conductivity, be easy to operate, can form short slag, for vertical, overhead welding, have remarkable result, can produce active slag, uniform fold is protected weld seam in welded joints, and de-slag is easy, and crystallization rate is fast, can make weld ripples careful;

The Main Function of potassic feldspar is stabilising arc, slag making, is conducive in right amount de-slag, but the weldering of too much can slowing down is fast, the viscosity of increase slag, therefore the consumption of potassic feldspar is fixed on to 3～9% the bests of coating weight;

The Main Function of mica is stabilising arc, slag making, high resilience, being conducive to welding rod produces, can increase coating gas permeability, thus to coating is easy to crack and rubescent, prevent effect, but too much excessively thick mica can make coating loose, welding rod is broken head and scratch easily, can make coating too dry thick, surface quality is poor, therefore the consumption of mica is fixed on to 5～13% the bests of coating weight simultaneously;

Calcium carbonate and brium carbonate belong to carbonate together, and its Main Function is slag making, gas making; The main purpose of slag making is protection welding pool and improves appearance of weld; The main purpose of gas making is under high arc temperature effect, can decompose, and emits gas, to protect electric arc and molten bath, prevents oxygen in surrounding air and the intrusion of nitrogen;

Calcirm-fluoride and sodium fluoride belong to fluoride together, and its Main Function is slag making, dehydrogenation, and adjusting viscosity, improves slag spreadability; But fluoride is added and can be made weld fumes amount showed increased;

The Main Function of electrolytic manganese is deoxidation and infiltrates alloying element in weld seam;

The Main Function of crome metal and metallic nickel is to infiltrate alloying element in weld seam;

The Main Function of molybdenum-iron is to infiltrate alloying element in weld seam;

The Main Function of lanthana is crystal grain thinning, changes shape, quantity and the distribution of field trash, thereby reduces its illeffects to toughness and crack resistance; Also there is certain ability of dehydrogenation simultaneously.

The austenitic electrode of the ultralow-temperature high-toughness of said components, has excellent ultralow-temperature high-toughness, particularly under the ultra-low temperature surroundings of-196 ℃, more than its impact value can reach 33J.

In the present invention: coating adopts TiO ₂-SiO ₂-CaO slag system, thereby there is very excellent welding technological properties; Deposited metal has good mechanical performance, especially has good low-temperature type; The ferrite number scope of deposited metal is strict controlled in 3-5, so both can reduce the fragility of bringing due to ferrite, also can absorb impurity element by ferrite, thereby improves its heat crack resistance; In coating, add a small amount of lanthana, not only can improve intensity and toughness by crystal grain thinning, can also reduce its illeffects to toughness and crack resistance by changing shape, the quantity of field trash and distributing, rare-earth elements La can improve the fusing point of MnS on the one hand simultaneously, form dystectic compound with S on the other hand, this two aspect is all conducive to improve hot-cracking resistance.

The invention has the beneficial effects as follows: in sum, welding rod welding arc stablility of the present invention, appearance of weld is attractive in appearance, ripple is fine and smooth, it is few to splash, de-slag is easy, can adopt power of alterating and direct current, is suitable for all-position welding; Its deposited metal has good mechanical performance, especially has excellent ultralow temperature impact flexibility ,-196 ℃ of impact values that can obtain more than 33J; The ferrite number of deposited metal is strict controlled in to 3-5, so not only can guarantees to there is good heat crack resistance, and can reduce the fragility of bringing due to ferrite.

The specific embodiment

The present invention is combined by core wire and coating, and its core wire adopts Cr-Ni-Mn type alloy system, and its component is as following table (percentage by weight):

C	Si	Mn	Cr
				0.006-0.015	0.08-0.20	1.80-2.25	18.5-21.0
Ni	P	S	Fe
				9.0-10.0	0.008-0.015	0.008-0.015	Surplus

Its coating adopts TiO2-SiO2-CaO slag system, and its component is as following table (percentage by weight):

Rutile	Titanium dioxide	Potassic feldspar	Mica	Calcium carbonate	Brium carbonate	Calcirm-fluoride
							25-40	1-4	3-12	5-15	5-15	3-8	2-8
Sodium fluoride	Electrolytic manganese	Crome metal	Metallic nickel	Molybdenum-iron	Lanthana
							3-8	2-6	5-12	1-4	1-4	0.01-1.5

Better coating component is preferably as follows table (percentage by weight):

In order to understand better the present invention, below by embodiment 1-6, further illustrate, but the present invention is not limited to following embodiment:

Embodiment 1:

Adopt general manufacturing process in welding rod production industry, by the core wire formula of table 1-1, make core wire, according to the coating recipe of table 1-2, prepare and prepare electrode coating by being dry mixed wet mixing, electrode coating is coated on core wire, make it moulding:

Table 1-1 core wire formula (unit: percentage by weight)

C	Si	Mn	Cr	Ni	P	S	Fe
								0.008	0.20	2.0	19.0	9.5	0.010	0.010	Surplus

Table 1-2 coating recipe (unit: percentage by weight)

The chemical composition of its deposited metal is in Table 1-3, and mechanical property and ferrite number are in Table 1-4 and table 1-5, and wherein ferritic test adopts method of magnetic, surveys ten points (remove the starting the arc and receive arc place) of weld seam, then it is averaged.

Chemical composition (the unit: the percentage of welding rod weight) of table 1-3 deposited metal

C	Mn	Si	P	S	Ni	Cr	Mo	Cu	V
										0.024	1.52	0.69	0.027	0.002	10.5	18.6	0.25	0.02	0.057

The mechanical property of table 1-4 deposited metal

The ferrite number of table 1-5 deposited metal

Single value	Mean value
		3.4/3.5/4.6/4.2/3.5/4.1/3.2/3.8/3.9/4.3	3.85

Embodiment 2:

Adopt the welding rod manufacture method identical with embodiment 1, by the coating recipe of the core wire formula of table 2-1 and table 2-2, prepare:

Table 2-1 core wire formula (unit: percentage by weight)

C	Si	Mn	Cr	Ni	P	S	Fe
								0.012	0.15	2.1	20.0	9.9	0.012	0.007	Surplus

Table 2-2 coating recipe (unit: percentage by weight)

The chemical composition of its deposited metal is in Table 2-3, and mechanical property and ferrite number be in Table 2-4 and table 2-5, and the experimental technique of ferrite number is with embodiment 1:

Chemical composition (the unit: the percentage of welding rod weight) of table 2-3 deposited metal

C	Mn	Si	P	S	Ni	Cr	Mo	Cu	V
										0.023	1.55	0.69	0.024	0.003	10.2	18.2	0.30	0.01	0.054

The mechanical property of table 2-4 deposited metal

The ferrite number of table 2-5 deposited metal

Single value	Mean value
		4.0/3.6/4.2/3.4/3.7/3.1/4.4/4.6/4.3/4.8	4.01

Embodiment 3:

Adopt the welding rod manufacture method identical with embodiment 1, by the coating recipe of the core wire formula of table 3-1 and table 3-2, prepare:

Table 3-1 core wire formula (unit: percentage by weight)

C	Si	Mn	Cr	Ni	P	S	Fe
								0.006	0.12	1.8	20.5	9.0	0.011	0.011	Surplus

Table 3-2 coating recipe (unit: percentage by weight)

The chemical composition of its deposited metal is in Table 3-3, and mechanical property and ferrite number be in Table 3-4 and table 3-5, and the experimental technique of ferrite number is with embodiment 1:

Chemical composition (the unit: the percentage of welding rod weight) of table 3-3 deposited metal

C	Mn	Si	P	S	Ni	Cr	Mo	Cu	V
										0.026	1.58	0.63	0.021	0.005	10.0	18.0	0.35	0.02	0.049

The mechanical property of table 3-4 deposited metal

The ferrite number of table 3-5 deposited metal

Single value	Mean value
		4.2/4.6/3.1/3.5/4.5/4.2/3.8/3.2/4.7/4.2	4.00

Embodiment 4:

Adopt the welding rod manufacture method identical with embodiment 1, by the coating recipe of the core wire formula of table 4-1 and table 4-2, prepare:

Table 4-1 core wire formula (unit: percentage by weight)

C	Si	Mn	Cr	Ni	P	S	Fe
								0.015	0.08	2.0	18.5	10.0	0.015	0.010	Surplus

Table 4-2 coating recipe (unit: percentage by weight)

The chemical composition of its deposited metal is in Table 4-3, and mechanical property and ferrite number be in Table 4-4 and table 4-5, and the experimental technique of ferrite number is with embodiment 1:

Chemical composition (the unit: the percentage of welding rod weight) of table 4-3 deposited metal

C	Mn	Si	P	S	Ni	Cr	Mo	Cu	V
										0.025	1.53	0.62	0.02	0.015	10.2	18.5	0.3	0.02	0.049

The mechanical property of table 4-4 deposited metal

The ferrite number of table 4-5 deposited metal

Single value	Mean value
		4.2/4.5/3.0/3.5/4.5/4.2/3.7/3.2/4.6/4.2	3.96

Embodiment 5:

Adopt the welding rod manufacture method identical with embodiment 1, by the coating recipe of the core wire formula of table 5-1 and table 5-2, prepare:

Table 5-1 core wire formula (unit: percentage by weight)

C	Si	Mn	Cr	Ni	P	S	Fe
								0.008	0.15	2.25	19.5	9.3	0.008	0.01	Surplus

Table 5-2 coating recipe (unit: percentage by weight)

The chemical composition of its deposited metal is in Table 5-3, and mechanical property and ferrite number be in Table 5-4 and table 5-5, and the experimental technique of ferrite number is with embodiment 1:

Chemical composition (the unit: the percentage of welding rod weight) of table 5-3 deposited metal

C	Mn	Si	P	S	Ni	Cr	Mo	Cu	V
										0.022	1.60	0.65	0.023	0.006	9.8	18.2	0.36	0.02	0.049

The mechanical property of table 5-4 deposited metal

The ferrite number of table 5-5 deposited metal

Single value	Mean value
		4.2/4.5/3.1/3.4/4.6/4.3/3.6/3.2/5/4.3	4.02

Embodiment 6:

Adopt the welding rod manufacture method identical with embodiment 1, by the coating recipe of the core wire formula of table 6-1 and table 6-2, prepare:

Table 6-1 core wire formula (unit: percentage by weight)

C	Si	Mn	Cr	Ni	P	S	Fe
								0.012	0.1	2.2	21	9.2	0.009	0.008	Surplus

Table 6-2 coating recipe (unit: percentage by weight)

The chemical composition of its deposited metal is in Table 6-3, and mechanical property and ferrite number be in Table 6-4 and table 6-5, and the experimental technique of ferrite number is with embodiment 1:

Chemical composition (the unit: the percentage of welding rod weight) of table 6-3 deposited metal

C	Mn	Si	P	S	Ni	Cr	Mo	Cu	V
										0.026	1.58	0.61	0.021	0.006	10.3	18.1	0.35	0.02	0.048

The mechanical property of table 6-4 deposited metal

The ferrite number of table 6-5 deposited metal

Single value	Mean value
		4.2/4.6/3/3.3/4.5/4.2/3.8/3.2/4.6/4.2	3.96

Above-mentioned experiment is visible, and welding rod welding arc stablility of the present invention, appearance of weld is attractive in appearance, ripple is fine and smooth, it is few to splash, de-slag is easy, can adopt power of alterating and direct current, is suitable for all-position welding; Its deposited metal has good mechanical performance, especially has excellent ultralow temperature impact flexibility ,-196 ℃ of impact values that can obtain more than 33J; The ferrite number of deposited metal is strict controlled in to 3-5, so not only can guarantees to there is good heat crack resistance, and can reduce the fragility of bringing due to ferrite.

Claims

1. a ultralow-temperature high-toughness austenitic electrode, consists of core wire and coating, and coating is coated on core wire outer wall, the weight coefficient that described coating accounts for welding rod gross weight is 0.4～0.5, it is characterized in that: take core wire gross weight as benchmark, by weight percentage, described core wire is comprised of following component:

C：0.006～0.015%；

Si：0.08～0.20%；

Mn：1.8～2.25%；

Cr：18.5～21.0%；

Ni：9.0～10.0%；

P：0.008～0.015%；

S：0.008～0.015%；

Fe: surplus;

Rutile: 25～40%;

Titanium dioxide: 1～4%;

Potassic feldspar: 3～12%;

Mica: 5～15%;

Calcium carbonate: 5～15%;

Brium carbonate: 3～8%;

Calcirm-fluoride: 2～8%;

Sodium fluoride: 3～8%;

Electrolytic manganese: 2～6%;

Crome metal: 5～12%;

Metallic nickel: 1～4%;

Molybdenum-iron: 1～4%;

Lanthana: 0.01～1.5%.

2. ultralow-temperature high-toughness austenitic electrode according to claim 1, is characterized in that: take coating gross weight as benchmark, by weight percentage, described coating is comprised of following component:

Rutile: 28～35%;

Titanium dioxide: 1～4%;

Potassic feldspar: 3～9%;

Mica: 5～13%;

Calcium carbonate: 5～10%;

Brium carbonate: 3～8%;

Calcirm-fluoride: 4～8%;

Sodium fluoride: 3～8%;

Electrolytic manganese: 2～6%;

Crome metal: 5～12%;

Metallic nickel: 1～4%;

Molybdenum-iron: 1～4%;

Lanthana: 0.01-1.15%.